a = [[75],
     [95, 64],
     [17, 47, 82],
     [18, 35, 87, 10],
     [20, 4, 82, 47, 65],
     [19, 1, 23, 75, 3, 34],
     [88, 2, 77, 73, 7, 63, 67],
     [99, 65, 4, 28, 6, 16, 70, 92],
     [41, 41, 26, 56, 83, 40, 80, 70, 33],
     [41, 48, 72, 33, 47, 32, 37, 16, 94, 29],
     [53, 71, 44, 65, 25, 43, 91, 52, 97, 51, 14],
     [70, 11, 33, 28, 77, 73, 17, 78, 39, 68, 17, 57],
     [91, 71, 52, 38, 17, 14, 91, 43, 58, 50, 27, 29, 48],
     [63, 66, 4, 68, 89, 53, 67, 30, 73, 16, 69, 87, 40, 31],
     [4, 62, 98, 27, 23, 9, 70, 98, 73, 93, 38, 53, 60, 4, 23]]
if __name__ == '__main__':
    index = 0
    row = len(a)
    b = []
    for i in range(1, len(a) + 1):
        b.append([0 for _ in range(i)])
    b[-1][:] = a[-1][:]
    for i in range(len(a) - 1, 0, -1):
        for j in range(len(b[i - 1])):
            b[i - 1][j] = a[i - 1][j] + (b[i][j] if b[i][j] > b[i][j + 1] else b[i][j + 1])
    b[0][0] = a[0][0] + (b[1][0] if b[1][0] > b[1][1] else b[1][1])
    print(b[0][0])
